Why Do Contacts Feel Dry on Airplanes?
You board, get settled, and maybe start a movie. Somewhere between takeoff and cruising altitude, your eyes start to feel a little off. Not painful, just…really dry. Your contact lenses suddenly become something you’re aware of, and they’re pretty uncomfortable.
What Changes When You’re in the Air
At cruising altitude, the air outside the plane is extremely cold and holds almost no moisture. When that air is drawn into the cabin, it has to be heated and pressurized to be safe to breathe, but it doesn’t regain much humidity in the process.
Airplane air is conditioned to be around 10 to 20 percent humidity, which is much lower than what your eyes are used to. Not to mention, there are AC vents at every single seat blowing a lot of air directly at your face.
Your eyes feel it in a more immediate way because they rely on a thin layer called the tear film to stay moisturized and comfortable.
When the air is this dry, that layer starts evaporating faster than your body can fully replace it.
Why It Always Seems to Happen Mid-Flight
At the beginning of the flight, your eyes still have enough moisture to stay balanced. Over time, the dry air keeps pulling from your tear film layer, little by little.
Then you add in a movie, your phone, maybe a window seat with air blowing nearby, and you’re blinking less without realizing it.
The lack of moisture in the air and the lack of replenishment from you blinking less can cause your contacts to feel really dry.
Do Some Contacts Handle Flights Better?
Sometimes. Daily lenses tend to feel a bit nicer on flights because you’re starting with a brand new lens at the beginning of the day.
Reusable lenses can still work perfectly fine, but once you’re in that environment long enough, most contacts will start to feel it in some way.
Things That Can Help
- Contact-lens compatible eye drops
- Consciously blinking more
- Drinking extra water
- Switching to your glasses while you’re on the flight (especially if you’re going to sleep)
Do You Need to Avoid Contacts When You Fly?
You don’t. It’s completely safe to wear contact lenses on a plane. The dryness you feel isn’t damaging your eyes or your lenses; it’s just a comfort issue.
Some people barely notice it. Others feel it every single time they fly.
If you’re someone who tends to notice it, bringing drops, staying hydrated, or even planning to switch to glasses partway through can make a big difference.
Why You Shouldn’t Sleep in Contacts on a Plane
Sleeping in contact lenses is never recommended.
Even outside of a plane, your eyes aren’t meant to have a lens sitting on them overnight unless it’s specifically prescribed for that purpose.
When you’re awake, you’re constantly blinking. That blinking keeps your tear film moving, helps your lenses stay hydrated, and clears away debris sitting on the surface of your eye.
When you fall asleep, your eyes are closed, so little to no oxygen reaches your cornea. You’re not blinking, so nothing is refreshing that tear layer.
Sleeping in contact lenses does increase the risk of eye infections and, in more serious cases, something like a corneal ulcer, which is an open sore on the surface of your eye that needs medical treatment.
That’s not common from a single nap, but it’s the reason the recommendation is so consistent.
If you know you’re going to sleep, it’s better to take your contacts out beforehand and switch to glasses.
It’s one of those small habits that protects your eyes long-term, especially in an environment like a plane.
FAQ
Why do my contacts feel fine at first and then suddenly dry?
At the start of a flight, your lenses are still holding onto their full moisture. As time passes, the low humidity in the cabin slowly pulls that moisture away.
Do eye drops fix it?
They can help quite a bit. Rewetting drops add moisture back to the surface of the lens and your eye, which can make things feel comfortable again, especially during longer flights.
Are daily contacts better for flying?
They often are. Since you’re starting with a fresh, fully hydrated pair, they tend to handle dry environments a little better than lenses that have already been worn and exposed to air over multiple days.
Is it better to just wear glasses on a plane?
For some people, yes. If your eyes are more sensitive to dryness, glasses will feel much better, especially on longer flights where the dry air has more time to affect your lenses.